I guess programing chips for the engine controller could be taboo, there are plenty of other sites for that. But most of the questions I have seen are guys trying to get an engine transplant to work.I think the concern was with the legal implications. If someone illegally modified their car (changed certain signals, or tampered with the computer, etc) and it caused issues with its operation, that's a legal issue and the forum didn't want to support that.
When a new member of the pyro forums first question is how to make M80,s he's gone!